Interleaved LCLC Resonant Converter With Precise Current Balancing Over a Wide Input Voltage Range

An interleaved LCLC resonant converter with accurate current balancing performance over a wide input voltage range is proposed. Resonant tank components have slight tolerances that can unbalance load sharing between paralleled phases. Because of the steep voltage gain curve of the LCLC resonant tank...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on power electronics 2021-09, Vol.36 (9), p.10330-10342
Main Authors: Forouzesh, Mojtaba, Liu, Yan-Fei
Format: Article
Language:English
Subjects:
Balancing
Capacitors
Circuits
Computer simulation
Converters
Current sharing
Inductors
Interleaved resonant converter
LCLC resonant converter
load current sharing
Load sharing
Magnetic resonance
Magnetic switching
multiphase
Resonant converters
RLC circuits
switch-controlled capacitor (SCC)
Switches
Tolerances
Unbalance
Voltage gain
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An interleaved LCLC resonant converter with accurate current balancing performance over a wide input voltage range is proposed. Resonant tank components have slight tolerances that can unbalance load sharing between paralleled phases. Because of the steep voltage gain curve of the LCLC resonant tank, most conventional current sharing approaches might not be effective. In the proposed converter, the impedances of the resonant tanks are matched by a switch-controlled capacitor (SCC) that is in series with the resonant capacitor resulting in precise load current balancing between phases. The impact of various unbalanced situations on the interleaved LCLC resonant converter is investigated, a minimum operating angle for the SCC circuit is identified, the basic accuracy of SCC current balancing via digital control is investigated, and a control strategy is proposed to perform the current sharing. Computer simulation results and experimental results from a GaN-based prototype validate the performance of the proposed interleaved LCLC converter with precise current sharing over a wide input voltage range from 250 to 400 V. Using enhancement mode GaN and benefiting from the interleaving feature, a high conversion efficiency is achieved on a two-phase 1 kW LCLC converter with peak efficiency of 96.7%.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2021.3059198